Abstract: Provided are an on-press development type lithographic printing plate precursor having a support and an image-recording layer on the support in which the image-recording layer contains a coloring compound capable of having a coloring reaction with a decomposition product generated by exposure of the image-recording layer, and an on-press development type lithographic printing plate precursor having a support and an image-recording layer on the support in which the image-recording layer contains a compound represented by Formula 1C or Formula 2C and an electron-donating polymerization initiator. In Formula 1C and Formula 2C, R1C to R4C each independently represent a monovalent organic group, L1C and L2C each independently represent a divalent organic group, AC represents OH or NR5CR6C, and R5C and R6C each independently represent a monovalent organic group.

Abstract: A lithographic printing plate precursor includes at least a white substrate and an image-recording layer, the white substrate has a reflection density of 0.25 or less at a side having the image-recording layer, and the image-recording layer contains an infrared absorbing agent, an onium salt polymerization initiator, a polymerizable compound and a color-forming compound and is capable of being removed with at least any one of printing ink and dampening water.

Abstract: By a method of preparing a lithographic printing plate having exposing a lithographic printing plate precursor including a photosensitive layer containing (A) a polymerization initiator, (B) a polymerizable compound, (C) a sensitizing dye and (D) a binder polymer and a protective layer in this order on a hydrophilic support with laser and then removing the protective layer and an unexposed area of the photosensitive layer in the presence of a developer, in which the developer is a developer which has pH of from 2 to less than 10 and contains an amphoteric surfactant and a nonionic surfactant having an alkylene oxide chain, a simple processing of one solution and one step which does not require a water washing step becomes possible, excellent development property is achieved and a lithographic printing plate which has good printing durability and does not cause printing stain can be provided.

Abstract: To provide a developer for processing of a lithographic printing plate precursor, containing a non-reducing sugar having bonded therein two or more monosaccharides and having a pH of 6 to 14 and thereby provide a developer having a pH stable to aging and an excellent film-forming property, a method for manufacturing a lithographic printing plate, where a lithographic printing plate excellent in developability and dispersibility of development scum and kept from staining of the non-image area can be manufactured even by simple processing of one solution and one step requiring no water washing step, a developer used therefor, and a printing method of performing printing by using the manufacturing method of a lithographic printing plate.

Abstract: To provide a developer for processing of a lithographic printing plate precursor, containing a non-reducing sugar having bonded therein two or more monosaccharides and having a pH of 6 to 14 and thereby provide a developer having a pH stable to aging and an excellent film-forming property, a method for manufacturing a lithographic printing plate, where a lithographic printing plate excellent in developability and dispersibility of development scum and kept from staining of the non-image area can be manufactured even by simple processing of one solution and one step requiring no water washing step, a developer used therefor, and a printing method of performing printing by using the manufacturing method of a lithographic printing plate.

Abstract: By a method of preparing a lithographic printing plate having exposing a lithographic printing plate precursor including a photosensitive layer containing (A) a polymerization initiator, (B) a polymerizable compound, (C) a sensitizing dye and (D) a binder polymer and a protective layer in this order on a hydrophilic support with laser and then removing the protective layer and an unexposed area of the photosensitive layer in the presence of a developer, in which the developer is a developer which has pH of from 2 to less than 10 and contains an amphoteric surfactant and a nonionic surfactant having an alkylene oxide chain, a simple processing of one solution and one step which does not require a water washing step becomes possible, excellent development property is achieved and a lithographic printing plate which has good printing durability and does not cause printing stain can be provided.

Abstract: A lithographic printing plate precursor comprising: a support; and at least one layer comprising an image-recording layer, the image-recording layer comprising (A) an infrared absorber, (B) a polymerization initiator, (C) a polymerizable compound, and (D) a binder polymer, wherein the image recording layer is capable of being removed with at least one of a printing ink and a fountain solution, wherein at least one of said at least one layer comprises a copolymer having (a1) a unit comprising at least one ethylenically unsaturated bond, and (a2) a unit comprising at least one functional group interacting with a surface of the support. And a lithographic printing method in which the lithographic printing plate precursor is used. The copolymer preferably has a hydrophilic segment. The copolymer preferably is contained in an undercoat layer formed between the support and the image-recording layer.

Abstract: According to a method of preparing a lithographic printing plate comprising processing a lithographic printing plate precursor having a photosensitive layer containing a hexaarylbiimidazole compound and a protective layer with a developer containing a specific organic solvent and at least any of a surfactant and a water-soluble polymer compound, the occurrence of development scum is prevented and both good developing property and printing durability can be achieved. Further, since it becomes possible to conduct one bath processing with a weak alkaline developer, advantages, for example, simplification of processing steps, consideration for global environment and adaptation for space saving and low running cost can be achieved.

Abstract: A plate-making method includes: exposing a lithographic printing plate precursor with laser; and rubbing a surface of the exposed lithographic printing plate precursor with a rubbing member in the presence of a developer having pH of from 2 to 11 and containing a water-soluble polymer compound to remove the protective layer and an unexposed area of the photosensitive layer, the lithographic printing plate precursor includes, in the following order, a hydrophilic support, a photosensitive layer containing a polymerization initiator, a polymerizable compound, a sensitizing dye and a binder polymer and a protective layer, and the water-soluble polymer compound is a vinyl copolymer containing a monomer unit having at least one functional group capable of interacting with a surface of the support and a monomer unit having at least one hydrophilic group which is different from the functional group capable of interacting with a surface of the support.

Abstract: According to a method of preparing a lithographic printing plate substantially comprising a step of imagewise exposing a negative lithographic printing plate precursor having an image-recording layer containing (i) a sensitizing dye, (ii) a photopolymerization initiator, (iii) an addition polymerizable compound having an ethylenically unsaturated double bond and (iv) a binder polymer on a support and a step of processing the exposed lithographic printing plate precursor with an aqueous solution containing a carbonate ion, a hydrogen carbonate ion and a surfactant, the processing property is improved, a printing plate free from the tackiness on the surface thereof can be provided, even when the printing plate is stored after the development until printing, deterioration of the printing durability does not occur, and it becomes possible to conduct one solution development with a weak alkaline processing solution.

Abstract: Provided are, as a lithographic printing plate precursor that enables good development with a developer having a pH from 2 to 10 and is excellent in runlength and stain resistance and a production process of a lithographic printing plate using the precursor, a lithographic printing plate precursor whose photosensitive layer contains the following components (A), (B), and (C): (A) a copolymer having a repeating unit of the formula (1) and at least one of a repeating unit of the formula (2) and a repeating unit of the formula (3): wherein each of A and B independently represents a hetero atom, each of R and R1 to R9 represents a monovalent substituent, L represents a divalent linking group, X represents a hydroxyl group, a monovalent group containing an acid group, an alkyleneoxy group, an amide group, or an ether group, an amino group, an ammonium group, or a salt obtained by neutralizing an acid group, and L0 represents a single bond or divalent hydrocarbon group, (B) a compound having an ethylen

Abstract: To provide a method of preparing a lithographic printing plate which is safe, exhibits excellent developing property and processing ability, and enables processing with one solution by processing after image exposure, a negative lithographic printing plate precursor having an image-recording layer containing (i) a sensitizing dye, (ii) a photopolymerization initiator, (iii) an addition polymerizable compound having an ethylenically unsaturated double bond, and (iv) a binder polymer on a hydrophilic support with an aqueous solution containing a carbonate ion, a hydrogen carbonate ion and a water-soluble polymer compound.

Abstract: A lithographic printing process which comprises the steps of: imagewise scanning with a laser a presensitized lithographic plate which comprises a hydrophilic support and an image-recording layer containing a polymerization initiator, an ethylenically unsaturated polymerizable compound having no adherence to the hydrophilic support, and an ethylenically unsaturated polymerizable compound having adherence to the hydrophilic support and a molecular structure comprising a polyoxyalkylene group to polymerize the ethylenically unsaturated polymerizable compounds within the exposed area; removing the image-recording layer within the unexposed area from the lithographic plate mounted on a cylinder of a printing press; and then printing an image with the lithographic plate mounted on the cylinder of the printing press. A presensitized lithographic plate is also disclosed.

Abstract: A method for producing a lithographic printing plate is provided, wherein, in the non-alkaline development of a lithographic printing plate precursor having a protective layer, even if the protective layer components are mingled into the developer, the reduction in development removability of the image recording layer and the generation of development scum can be inhibited; an on-press development type lithographic printing plate precursor with excellent inking property, high scratch resistance, satisfied on-press developability and good fine line reproducibility is provided; and a lithographic printing method is provided, each of which is a method for producing a lithographic printing plate, comprising: imagewise exposing a lithographic printing plate precursor comprising a support, an image recording layer and a protective layer, and rubbing the plate surface by a rubbing member of an automatic processor in the presence of a developer at a pH of 2 to 10 to remove the protective layer and the image recording

Abstract: A method for preparing a lithographic printing plate comprising: exposing a lithographic printing plate precursor comprising a hydrophilic support, a photosensitive layer containing (A) a sensitizing dye having an absorption maximum in a wavelength range of from 350 to 450 nm represented by the formula (I) or (II) as defined herein, (B) a polymerization initiator, (C) a polymerizable compound and (D) a hydrophobic binder polymer having an acid value of 0.3 meq/g or less and a protective layer provided in this order with a laser beam of from 350 to 450 nm; and rubbing a surface of the exposed lithographic printing plate precursor with a rubbing member in a presence of a developer having pH of from 2 to 10 in an automatic processor equipped with the rubbing member to remove the protective layer and an unexposed area of the photosensitive layer.

Abstract: A method for producing a lithographic printing plate is provided, wherein, in the non-alkaline development of a lithographic printing plate precursor having a protective layer, even if the protective layer components are mingled into the developer, the reduction in development removability of the image recording layer and the generation of development scum can be inhibited; an on-press development type lithographic printing plate precursor with excellent inking property, high scratch resistance, satisfied on-press developability and good fine line reproducibility is provided; and a lithographic printing method is provided, each of which is a method for producing a lithographic printing plate, comprising: imagewise exposing a lithographic printing plate precursor comprising a support, an image recording layer and a protective layer, and rubbing the plate surface by a rubbing member of an automatic processor in the presence of a developer at a pH of 2 to 10 to remove the protective layer and the image recording

Abstract: A method for preparation of a lithographic printing plate including: exposing with a laser a lithographic printing plate precursor including a support and a photosensitive layer containing a sensitizing dye, a radical polymerization initiator, a radical polymerizable compound and a binder polymer; and subjecting the exposed lithographic printing plate precursor to development processing with a developer having pH of from 3 to 9 to remove an unexposed area of the photosensitive layer, wherein the binder polymer is a polymer having an acid value of from 10 to 250 mg-KOH/g and the developer contains a compound represented by one of the formulae <1>, <2> and <3> defined herein.

Abstract: An image forming method in which a planographic printing plate precursor having, on a support, an image recording layer containing (A) a polymerization initiator, (B) a polymerizable compound, and (C) a binder polymer, and having photosensitivity in a wavelength range of 250 nm to 420 nm, is subjected to exposure using laser light in the wavelength range of 250 nm to 420 nm, and a one-pixel drawing time is one millisecond or less, a planographic printing plate precursor having the image recording layer which further contains (D) a compound having a polymerizable group and a support adsorptive group, or (F) a filler, and a planographic printing method including development-on-machine, are provided.

Abstract: A method of preparing a lithographic printing plate includes: exposing imagewise a lithographic printing plate precursor including a hydrophilic support and a photosensitive layer containing a spectral sensitizer, a polymerization initiator, a co-initiator, a polymerizable monomer and a binder polymer with a laser light source having an emission wavelength in a range of from 350 to 450 nm; and removing an unexposed area of the photosensitive layer in the presence of a developer having pH of from 9.1 to 11 and containing a carbonate ion, a hydrogen carbonate ion and at least one of a surfactant and a water-soluble polymer compound, and the co-initiator is a tribromoacetylamide compound.

Abstract: The invention provides an image recording method and a lithographic printing method in which both high image quality and good fine line reproducibility can be achieved, and high sensitivity and safety under white light can be obtained, and the image recording method for a lithographic printing plate, which comprises imagewise exposing with an imaging time per pixel of 1 millisecond or less using a laser light with an emission wavelength of from 250 nm to 420 nm, wherein the lithographic printing plate precursor comprises a support and an image recording layer, in which the image recording layer contains (A) a polymerization initiator and (B) a polymeric compound and has an image recording layer which is photosensitive in a wavelength of from 250 nm to 420 nm, and the support has an anodized film with sealed micropores on the surface; and a lithographic printing method utilizing the same.